PHP filesize() | Get Size of File

The PHP filesize() function returns the size of specified file in bytes. For example:

<?php
   echo filesize("codescracker.txt");
?>

The output produced by above PHP example on filesize() function is:

And here is the snapshot of the file codescracker.txt, used in above example:

PHP filesize() Syntax

The syntax of filesize() function in PHP, is:

filesize(fileName)

PHP Get File Size in KB using filesize()

<?php
   $myfile = "codescracker.txt";
   $x = filesize($myfile);
   $x = $x/1024;
   
   echo "<p>Size of File, $myfile is $x KB</p>";
?>

The output produced by above PHP example, to find and print the size of a file in KB, is:

If you want to remove all the digits after the decimal, then put (int) before the size, in similar way as done in following program:

<?php
   $myfile = "favicon.ico";
   $x = filesize($myfile);
   $x = (int)($x/1024);
   
   echo "<p>Size = $x KB</p>";
?>

Now the output should be Size = 30 KB, because the file favicon.ico is of 30 KB. I've not used codescracker.txt file in above example, as the size of that file is 46 bytes, that will give 0 KB as output.

PHP Get File Size in MB using filesize()

<?php
   $myfile = "C:/xampp/xampp-control.exe";
   $x = filesize($myfile);
   $x = (int)($x/1024/1024);
   
   echo "<p>Size = $x MB</p>";
?>

The output produced by this PHP example, that prints the size of xampp-control.exe file available in C:/xampp/ directory, is shown in the snapshot given below:

And here is the snapshot of the file along with directory used in above example:

PHP Get File Size in GB using filesize()

<?php
   $myfile = "F:/sw/os/windows64.iso";
   $x = filesize($myfile);
   $x = (int)($x/1024/1024/1024);
   
   echo "<p>Size = $x GB</p>";
?>

Since the size of file windows64.iso is 5.1GB, therefore after removing .1, you will get Size = 5 GB as output.

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